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 #include &lt;QtGui&gt;

 #include &quot;highlighter.h&quot;

 Highlighter::Highlighter(QTextDocument *parent)
     : QSyntaxHighlighter(parent)
 {
     HighlightingRule rule;

     keywordFormat.setForeground(Qt::darkBlue);
     keywordFormat.setFontWeight(QFont::Bold);
     QStringList keywordPatterns;
     keywordPatterns &lt;&lt; &quot;\\bchar\\b&quot; &lt;&lt; &quot;\\bclass\\b&quot; &lt;&lt; &quot;\\bconst\\b&quot;
                     &lt;&lt; &quot;\\bdouble\\b&quot; &lt;&lt; &quot;\\benum\\b&quot; &lt;&lt; &quot;\\bexplicit\\b&quot;
                     &lt;&lt; &quot;\\bfriend\\b&quot; &lt;&lt; &quot;\\binline\\b&quot; &lt;&lt; &quot;\\bint\\b&quot;
                     &lt;&lt; &quot;\\blong\\b&quot; &lt;&lt; &quot;\\bnamespace\\b&quot; &lt;&lt; &quot;\\boperator\\b&quot;
                     &lt;&lt; &quot;\\bprivate\\b&quot; &lt;&lt; &quot;\\bprotected\\b&quot; &lt;&lt; &quot;\\bpublic\\b&quot;
                     &lt;&lt; &quot;\\bshort\\b&quot; &lt;&lt; &quot;\\bsignals\\b&quot; &lt;&lt; &quot;\\bsigned\\b&quot;
                     &lt;&lt; &quot;\\bslots\\b&quot; &lt;&lt; &quot;\\bstatic\\b&quot; &lt;&lt; &quot;\\bstruct\\b&quot;
                     &lt;&lt; &quot;\\btemplate\\b&quot; &lt;&lt; &quot;\\btypedef\\b&quot; &lt;&lt; &quot;\\btypename\\b&quot;
                     &lt;&lt; &quot;\\bunion\\b&quot; &lt;&lt; &quot;\\bunsigned\\b&quot; &lt;&lt; &quot;\\bvirtual\\b&quot;
                     &lt;&lt; &quot;\\bvoid\\b&quot; &lt;&lt; &quot;\\bvolatile\\b&quot;;
     foreach (QString pattern, keywordPatterns) {
         rule.pattern = QRegExp(pattern);
         rule.format = keywordFormat;
         highlightingRules.append(rule);
     }

     classFormat.setFontWeight(QFont::Bold);
     classFormat.setForeground(Qt::darkMagenta);
     rule.pattern = QRegExp(&quot;\\bQ[A-Za-z]+\\b&quot;);
     rule.format = classFormat;
     highlightingRules.append(rule);

     singleLineCommentFormat.setForeground(Qt::red);
     rule.pattern = QRegExp(&quot;<span class="comment">//</span>[^\n]*&quot;);
     rule.format = singleLineCommentFormat;
     highlightingRules.append(rule);

     multiLineCommentFormat.setForeground(Qt::red);

     quotationFormat.setForeground(Qt::darkGreen);
     rule.pattern = QRegExp(&quot;\&quot;.*\&quot;&quot;);
     rule.format = quotationFormat;
     highlightingRules.append(rule);

     functionFormat.setFontItalic(true);
     functionFormat.setForeground(Qt::blue);
     rule.pattern = QRegExp(&quot;\\b[A-Za-z0-9_]+(?=\\()&quot;);
     rule.format = functionFormat;
     highlightingRules.append(rule);

     commentStartExpression = QRegExp(&quot;/\\*&quot;);
     commentEndExpression = QRegExp(&quot;\\*/&quot;);
 }

 void Highlighter::highlightBlock(const QString &amp;text)
 {
     foreach (HighlightingRule rule, highlightingRules) {
         QRegExp expression(rule.pattern);
         int index = text.indexOf(expression);
         while (index &gt;= 0) {
             int length = expression.matchedLength();
             setFormat(index, length, rule.format);
             index = text.indexOf(expression, index + length);
         }
     }
     setCurrentBlockState(0);

     int startIndex = 0;
     if (previousBlockState() != 1)
         startIndex = text.indexOf(commentStartExpression);

     while (startIndex &gt;= 0) {
         int endIndex = text.indexOf(commentEndExpression, startIndex);
         int commentLength;
         if (endIndex == -1) {
             setCurrentBlockState(1);
             commentLength = text.length() - startIndex;
         } else {
             commentLength = endIndex - startIndex
                             + commentEndExpression.matchedLength();
         }
         setFormat(startIndex, commentLength, multiLineCommentFormat);
         startIndex = text.indexOf(commentStartExpression,
                                                 startIndex + commentLength);
     }
 }</pre>
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